Solution:

The Outside

Solution:

A Coffin

Solution:

Dozens

Solution:

Each word has 3 consecutive letters of the alphabet-
couGHIng (GHI)
thiRSTy (RST)
DEFiant (DEF)

Solution:

SQRT(.2 ^ -2)

Take .2 and raise it to the power of -2 and then take the square root.

Solution:

Yes it is possible only under the following condition or situation.

When the twins were born, their mother was on a ship or boat. The elder one was born on 1st of March. But just after his birth before the younger one could be born, the boat crossed the international time zone and thus, the younger one was born on 28th of February.

Now whenever, a leap year falls, the younger brother will celebrate his birthday two days before the elder one.

Solution:

Arc + tick + circle.
= Artic Circle

Solution:

Rendezvous

Solution:

On a sailboat (sale boat).

Solution:

A bubble.

A bubble is lighter than air, but no matter how many people try, they cannot lift or hold a bubble in their hands because it will burst upon contact.